Ben
It depends on which ones. Here is a link that might help.

Andy
I believe you have what is referred to as Hall Of Fame (HOF) figures, if they are 12" tall and in blue boxes. All GI Joe figures have struggled to hold their value. The HOF figures are the worst of the lot. While made by Hasbro they carry the Kenner name and use a simple doll body Kenner used for the 1970s 12" Star Wars figure. If you can find somebody to pay you what you paid for them take it. In reality your going to be lucky to get $5 for each.